Clamp for bias-cutting machines.



E. PICKETT. CLAMP FOR BIAS CUTTING MACHIVNES. APPLICATION FILED JULY 23,1915.

1,162,727. 7 Patented Nov. 30, 1915.

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E. PICKETTI CLAMP FOR BIAS CUTTING MACHINES.

APPLICATION FILED JULY 23. 1915.

machines are employed for strips from a rollof rubber treated fabric,

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EDWARD PICKETT, OF INDIANAPOLIS, INDIANA. Y

Be it known that I, Eowann PICKETT, a

' citizen of the United statesresiding at Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Clamps for Bias-Cutting Machines, of which the following is a full. clear, and exact description.

"- This invention relates to fabric cutting machines, and has for an object to provide a clamp for a machine of this type, which operates to prevent whipping back of the fabric from the knife after each out.

In connection with the building of tires, cutting bias such strips subsequently being wound on to a ring core to form the carcass of the tire.

The bias cutting machine embodies essentially a stock roll for rubber treated fabric, a vertically reciprocatingknife set at an oblique angle to the path of travel of the fabric for cutting bias strips from the fabric, a horizontally reciprocating finger bar which grasps the cut edge of the fabric after each descent of the knife and measures off a suitable width of fabric to be out upon the next descent of the knife, and an endless conveyor which carries the bias cut strips A disadvantage hither-- away from the knife.

to existing in a machine of this type, is that the fabric, due to-itsbeing tensioned somewhat llponbeing drawn forward under-"the knife by the finger' bar; whips back tovard the stock roll after the knife has descended, the result being can only grasp'a portion of the. cut edge in stead of grasping the entire cut edge. This necessitates frequent stops and considerable waste of material. vantage the present invention provides a clamp which anchors-the fabric stationary near the knife during the cutting operation and until the finger bar again grasps the fabric after each cut. as will hereinafter be more fully described.

With the above and other objects in view the invention consists in the novel details of construction and combination of parts here inafterfully described and claimed, it being understood that various modifications may be resorted towithin the scope of the appendedclaims without sacrificing any of the advantages or departing from the spirit of the invention. 7 v

The invention can'be readily understood p which responding parts that at times the finger bar To obviate this disad- I CLAMP FDR BIAS-CUTTING MACHINES.

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v Patented Flor. 30, Serial No. 41,ei59.

from the following description taken in con-v nection with the accompanying drawing, in

F gure 1 is a fragmentary plan view of a bias cutting machine equipped with my invention; Fig. 2 is a fragmentary detail plan view showing the clamp and operating mechanism; Fig. is a fragmentary detail side elevation showing the clamp controlling- Fig. 4 is atrigger and release therefor; fragmentary sectional view on the line H, Fig.2; Fig. 5 is a fragmentary sectional view on the line 5-5, Fig. 2; Fig. is a fragmentary sectional view on the line 6 6, Fig. 3.

Referring now to the drawings i1i which like characters of reference designate corin. the various views, 10 designates a vertically reciprocating knife which 'coacts with'a shear 11 in strips from awe-b of rubber treated fabric, supported upon a feed table 12. A finger bar 13 is reciprocated horizontally toward and away from the delivery side of the knife, by a rack and pinion device 14. The finger baris equipped with fingers 15 which grasp the cut edge of the fabric at the inward limit of movement of the bar, the fabric'edge being raised up from the shear 11, to permitof the fingers closing thereon. The fingers release the fabric at the outward limit of movement of the finger bar after the strip has been severed from the supply, the

--bias cut strip gravitating on to an endless carrier 1G, and being removed thereby from the knife. The whole mechanism is supported upon a frame 17.

n carryii'ig out the invention a clamp 18 is positioned to anchor the fabric on the table 12 at the feed side of the knife, the :clamp being disposed parallel to the knife and being of sufiicient length tdengag'e the entire width of the web of fabric. The clamp provided with a vertical stem 19 which is slidably fitted in a bearing 20 carried by the frame 17. Adjustably mounted on the stem is a stop 21, and clamped to the frame 22 of the knife is a. horizontally extending finger 23 which engages the stop 21 during the latter portion of the upstroke of the knife, thereby aising; the clampwith it.

his engagement islso timed that the. knife is raised out. of the cut and the fingers ofthe finger bar have been inserted underneath the knife'and have taken a firm hold throughout the cut edge of the fabric before the clamp cutting bias i 1 frame. -A rod 33 is releases the fabric and begins to raise with the knife. I y

s The clamp is locked in raised position while the finger bar' makes its outward stroke to draw a predetermined amount of the fabric underneath the knife, and to accomplish this a trigger 24 is pivoted as shown at 25 on the clamp, and is pressed by v a spring 26 to seat on top of an upright stem 27, carried in a bearing 28 on the table 12, this engagement being so timed to occur at the upper limit of movement of the clamp and prevent gravitation of the clamp.

In order that the clamp may be released to gravitate and anchor the fabric upon the table, a rock lever 30 is'pivoted intermediate its ends as shown at 31 onthe frame and is slidably' and pivotally connected at the inner end to the trigger stem 27, the outer end of the lever being slidably and pivotally connected to a cam 32 on the fixed to the finger bar, and moving outward with the bar, rocks the cam 32, which in, turn depresses the outer end of the rock lever with a resultant raising of the inner end "of the lever together with the trigger stem 27 ,4 whereby the trigger .is tripped and releases the clamp to drop with the knife. The stop 21 rides on top of the finger 23 during descent of the clamp and knife.

the clamp and knife come down together, -but the clamp strikes first and anchors the fabric, due to there being a greater distance between the stop ,21 and clamp 18 than between thefinger 23 .and cutting edge of the-knife, then the knife goes on and makes'the cut. The finger bar then releases the severed strip and makes an inward stroke, the knife raising meanwhile sufficiently on its upstroke to let the fingers under and grasp the cut edge of In operation,

- the fabric supply. 'The knife finger 23 carrying a measured width reaches the clamp stop 21 and raises the clamp to release the fabric just before the finger bar makes its outward stroke' The finger bar then tnakes its outward stroke of fabric underthe knife and halts to hold the fabric tantfor the-next cut. Simultaneously with the halting, the trigger is tripped and the clamp freed to come down with the knife and again anchor the fabric on the table, as" a ove described. y I Having thus described my invention, what I claim and desire to protect by Letters Patent-is: LA machine for cutting strips .from a web ofmaterial embodying a knife, a finger bar on the delivery side of the knife for drawing the material forward under the' knife, a' clamp. positioned on the feed side of the knife for anchoring the material until the finger bar grasps the same after each cut, and means for maintaining the-clamp in inoperative position While the finger'bar draws the material under the knife.

2. A machine for cutting strips from a Web of material embodying a'knife, a finger bar for drawing the material forward under bar for drawing the material forward under the knife, a clamp adapted to gravitate and anchor the material near the knife, a con nection between the knife andclamp Whereby the clamp is raised by the. knife after the fin er bar grasps, the material, means for loc ting the clamp. in raised, position while the finger bar is drawing the material under the knife, and a connection between the finger bar and said, means for freeing the clamp to drop with the knife to its operative position.

4. A machine foricutting strips from a web of material embodying a'knife, a finger,

bar. for drawing the material forward under the knife, a clamp disposed to anchor the -material near the knife, a stop carried bythe clamp, a finger carried. by the knife timed to intercept the stop and move the clamp to inoperative position after the knife has withdrawn sufficiently to letthe finger bar under and grasp the cut edge of the material, and means for maintaining the clamp in dIlOPQI'tttlVQPOSltlOII while the fin-' ger bar draws the material under the knife.

' 5. A machine for cutting strips from a web of material embodying a knife, a finger bar for drawing the material forward under the knife, a clamp disposed to anchor the material near the knife until the finger bar grasps the material after each cut, a connection between the knifeand clamp adapted to then move the clamp to inoperative position, a trigger device for locking the clamp in said inoperative position while the finger bar draws the material forward under the knife, and means carried by the finger bar for releasing the trigger device at the outer limit ofmovementof the finger barwhereby the clamp is freed to gravitate to oper ative position.

Signed at Indianapolis, rich, and State of Indiana,

of July, 1915. EDWARD PICKETT.

county of this 20a. day 

